What does "R-Value" refer to in insulation?

"R-Value" refers to the measure of thermal resistance of insulation. It indicates how well a specific type of insulation material can resist heat flow. The higher the R-Value, the greater the insulating effectiveness, meaning that the material is better at preventing heat from escaping or entering a building. Understanding R-Value is crucial for evaluating insulation performance to ensure energy efficiency and comfort in residential and light commercial construction, as it directly impacts heating and cooling costs.

Considering the other options, weight and durability do not directly correlate with the thermal resistance ability of insulation. The appearance rating also does not provide any information regarding the insulation’s ability to resist heat flow, which is the core function measured by R-Value. Hence, the correct answer emphasizes the importance of R-Value in assessing insulation performance in building applications.